scholarly journals Influence of the thermomechanical properties on the joining of adhesion incompatible polymers by form-fit using the vibration welding process

2019 ◽  
Vol 13 (4) ◽  
pp. 365-378 ◽  
Author(s):  
M. Wolf ◽  
S. Hertle ◽  
D. Drummer
Keyword(s):  
Welding Process ◽  
Thermomechanical Properties ◽  
Vibration Welding

scholarly journals Joining of Incompatible Polymer Combinations by Form Fit Using the Vibration Welding Process

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Michael Wolf ◽  
Tobias Kleffel ◽  
Christoph Leisen ◽  
Dietmar Drummer
Keyword(s):  
High Density Polyethylene ◽  
Test Specimen ◽  
Welding Process ◽  
High Potential ◽  
Melting Points ◽  
Polyamide 66 ◽  
Shear Tests ◽  
Polymer Metal ◽  
Close Range ◽  
Vibration Welding

The production of components consisting of various polymer types by welding is severely restricted and only possible for bonding compatible materials with melting points in a close range. Several modifications, such as the cross-linking of one joining partner, allow for circumventing the restrictions regarding the melting points but do not help in joining bonding incompatible materials. Investigations of dissimilar material combinations, especially from polymer-metal hybrid structures, show a high potential of connections based on form fits. Within the scope of this paper, the possibility of joining incompatible polymer combinations, such as polyamide 66 and high-density polyethylene, by micro form fit using the vibration welding process is analyzed. For this purpose, the generated bonding strength of the test specimen was determined by shear tests. Furthermore, the undercuts of the generated prestructures and the resulting bond of the test specimen were examined microscopically by computer-tomography. These investigations depict the high potential of joining incompatible polymer combinations by form fit in the vibration welding using prestructuring to generate undercuts.

scholarly journals Experimental approach to modeling of the plasticizing operation in the hot plate welding process

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Krzysztof Wałęsa ◽  
Krzysztof Talaśka ◽  
Dominik Wilczyński ◽  
Jan Górecki ◽  
Dominik Wojtkowiak
Keyword(s):  
Experimental Approach ◽  
Research Work ◽  
Welding Process ◽  
Thermomechanical Analysis ◽  
Thermomechanical Properties ◽  
Hot Plate ◽  
Butt Welding ◽  
Hot Plate Welding ◽  
Deformation Models ◽  
The Relationship

AbstractThe paper discusses the topic of butt welding of polyurethane drive belts by the hot plate method in the context of modeling the process of this technological operation. Based on the analysis of the butt welding process, a series of studies of the thermomechanical properties of the material from which the belt is made has been planned. The results will be used for mathematical modeling of the welding process, and in particular its most important phase: the plasticizing operation. On this basis, the study of the compression of cylindrical specimens taken from the belt has been performed at two different speeds. Their result is the relationship between the compressive stress σc and the modulus of longitudinal elasticity Ec at compression and: deformation εc, temperature value T, as well as the compressive velocity vc. In the next step, dynamic viscosity η of the belt material was determined based on the results of dynamic thermomechanical analysis. The research work culminated in the attempts to plasticize the material on a hot plate, in conditions similar to the process of industrial welding. These studies were performed at different speeds vpl, resulting in the correlation between the force required for plasticizing Fpl and the value of the speed of the belt end vpl relative to the hot plate heated to a temperature Tp. The obtained results will be used to formulate a mathematical model of plasticizing the material, based on the selected mechanical deformation models.

scholarly journals Preliminary research of the thermomechanical properties of the round drive belts

2019 ◽  
Vol 254 ◽  
pp. 06007 ◽  
Author(s):  
Krzysztof Wałęsa ◽  
Olga Mysiukiewicz ◽  
Michał Pietrzak ◽  
Jan Górecki ◽  
Dominik Wilczyński
Keyword(s):  
Welding Process ◽  
Thermoplastic Elastomer ◽  
Thermomechanical Properties ◽  
Automatic Welding ◽  
Technological Parameters ◽  
Hot Plate ◽  
Butt Welding ◽  
Hot Plate Welding ◽  
Preliminary Research ◽  
Force Time

Most of the industrial machines use round-shaped drive belts for power transfer. These drive belts are often a few millimeters in diameter, and made of thermoplastic elastomer, especially polyurethane. Their production process requires the bonding step, which is often performed by hot plate butt welding. The authors have undertaken an effort to design an automatic welding machine, which calls for an analysis of the hot plate welding process consisting in describing the dependency between the technological parameters (temperature, pressure force, time) and the quality of the joint. To analyze this process in a proper way, it is necessary to describe the physical phenomena in the material during temperature and force impacts. In this case the research of thermomechanical properties of the belts is needed. The paper shows results of some preliminary research of the thermomechanical properties of the polyurethane. This research allows to predict the material reaction to increased temperature and force during hot plate welding.

Study on the effect of the welding environment on the dynamic recrystallization phenomenon and residual stresses during the friction stir welding process of aluminum alloy

2021 ◽  
pp. 146442072110251
Author(s):  
Mahmoud Abbasi ◽  
Amin Abdollahzadeh ◽  
Behrouz Bagheri ◽  
Ahmad Ostovari Moghaddam ◽  
Farzaneh Sharifi ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Residual Stresses ◽  
Welding Process ◽  
Friction Stir ◽  
Friction Stir Welding Process ◽  
Underwater Friction Stir Welding ◽  
Processed Sample ◽  
Vibration Welding ◽  
Strength And Ductility

Various methods have been proposed to modify the friction stir welding. Friction stir vibration welding and underwater friction stir welding are two variants of this technique. In friction stir vibration welding, the adjoining workpieces are vibrated normal to the joint line while friction stir welding is carried out, while in underwater friction stir welding the friction stir welding process is performed underwater. The effects of these modified versions of friction stir welding on the microstructure and mechanical characteristics of AA6061-T6 aluminum alloy welded joints are analyzed and compared with the joints fabricated by conventional friction stir welding. The results indicate that grain size decreases from about 57 μm for friction stir welding to around 34 μm for friction stir vibration welding and about 23 μm for underwater friction stir welding. The results also confirm the evolution of Mg2Si precipitates during all processes. Friction stir vibration welding and underwater friction stir welding processes can effectively decrease the size and interparticle distance of precipitates. The strength and ductility of underwater friction stir welding and friction stir vibration welding processed samples are higher than those of the friction stir welding processed sample, and the highest strength and ductility are obtained for underwater friction stir welding processed samples. The underwater friction stir welding and friction stir vibration welding processed samples exhibit about 25% and 10% higher tensile strength compared to the friction stir welding processed sample, respectively. The results also indicate that higher compressive residual stresses are developed as underwater friction stir welding and friction stir vibration welding are applied.

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